<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意：只允许为第三分类设置相关参数！" type="warning" show-icon :closable="false"></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCatekeys"
            :options="catlist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handTableClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态参数的表格 -->
          <el-table :data="manyTableData" border stripe align="center">
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"align="center"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name" align="center"></el-table-column>
            <el-table-column label="操作"align="center">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog (scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态属性的表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
             <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column
            <!-- 索引列 -->
            <el-table-column type="index" align="center"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name" align="center"></el-table-column>
            <el-table-column label="操作" align="center">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog (scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="40%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="90px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="40%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的表单 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="90px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品分类列表数组
      catlist: [],
      //级联选择框的配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
        expandTrigger: "hover"
      },
      //级联选择框双向绑定到数组
      selectedCatekeys: [],

      //被激活的页签的名称
      activeName: "many",
      //动态参数的数据
      manyTableData: [],
      //静态属性的数据
      onlyTableData: [],
      //控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: ""
      },
      //添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称 ",
            trigger: "blur"
          }
        ]
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //修改的表单数据对象
      editForm: {},
      //修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称 ",
            trigger: "blur"
          }
        ]
      },

     
    }
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.catlist = res.data;

      console.log(this.catlist);
    },

    //级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParmsData();
    },

    //Tab页签点击事件的处理函数
    handTableClick() {
      console.log(this.activeName);
      this.getParmsData();
    },
    //获取参数的列表数据
    async getParmsData() {
      //证明选中的不是三级分类
      if (this.selectedCatekeys.length !== 3) {
        this.selectedCatekeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return;
      }

      // 证明选中的是三级分类
      console.log(this.selectedCatekeys);

      //根据所选分类的id 和当前所处的面板 获取对应的参数

      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      );

      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败！");
      }

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : []

        //控制文本框的显示与隐藏
        item.inputVisible = false

        //文本框中输入的值
        item.inputValue = ''
      });

      console.log(res.data);
      //对数据进行判断看是否与many或这个only匹配
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    //监听添加对话框的关闭
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },

    //点击按钮实现参数的添加
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return;

        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        );

        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败！");
        }
        this.$message.success("添加参数成功！");
        this.addDialogVisible = false;
        this.getParmsData();
      });
    },
    //点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const {
        data: res
      } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      );

      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败！");
      }
      this.editForm = res.data;

      this.editDialogVisible = true;
    },

    //重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    //点击按钮修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return;
        const {
          data: res
        } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败！");
        }
        this.$message.success("修改参数成功！");
        this.getParmsData();
        this.editDialogVisible = false;
      });
    },
    //根据id删除指定文件
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err);

      //用户取消了这次删除操作
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除！");
      }

      //删除的业务逻辑

      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );

      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败！");
      }

      this.$message.success("删除参数成功！");
      this.getParmsData();
    },
    //文本框失去焦点或按下了enter键
     handleInputConfirm(row){
      if(row.inputValue.trim().length ===0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果没有return，则证明输入的内容，需要做后续处理

      row.attr_vals.push(row.inputValue.trim())

        row.inputValue =''
        row.inputVisible = false

        //需要发起请求保存这次操作
        this.saveAttrVals(row)
    },
      //将对attr_vals 的操作保存到 数据库
   async saveAttrVals(row){
       //需要发起请求保存这次操作
      const{data:res} = await
      this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name:row.attr_name,
          attr_sel:row.attr_sel,
          attr_vals:row.attr_vals.join(' '),
        }
         )
        if(res.meta.status !==200){
          return this.$message.error('修改参数项失败！')
        }
        this.$message.success('修改参数项成功！')

    },
    //点击按钮展示文本输入框
    showInput(row){
      row.inputVisible = true
      //让文本框自动获得焦点
      //$nextTick方法的作用，就是当页面上原元素被重新渲染之后才会指定回调函数中的代码
       this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    //删除对应的参数可选项
    handleClose(i,row){
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  }, 
  computed: {
    //如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCatekeys.length !== 3) {
        return true;
      }
      return false;
    },

    //当前选中的三级分类Id
    cateId() {
      if (this.selectedCatekeys.length === 3) {
        return this.selectedCatekeys[2];
      }
      return null;
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    }
  }
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin:10px;
}
.input-new-tag{
  width:120px;
}
</style>